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JEE Mains · Physics · STD 12 -Electromagnetic induction
  • JEE Mains 2020
  • Medium
  • Numerical

A loop \(ABCDEFA\) of straight edges has six corner points \(\mathrm{A}(0,0,0), \mathrm{B}(5,0,0),\)\(\mathrm{C}(5,5,0) ,\mathrm{D}(0,5,0), \mathrm{E}(0,5,5)\) and \(\mathrm{F}(0,0,5) .\) The magnetic field in this region is \(\overrightarrow{\mathrm{B}}=(3 \hat{\mathrm{i}}+4 \hat{\mathrm{k}}) \;\mathrm{T}\). The quantity of flux through the loop \(\mathrm{ABCDEFA}(\text { in Wb })\) is

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Correct Answer

(D) \(175\)

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\(\overrightarrow{\mathrm{A}}_{\mathrm{ABCD}}=25 \hat{\mathrm{k}}\)

\(\overrightarrow{\mathrm{A}}_{\mathrm{ADEF}}=25 \hat{\mathrm{i}}\)

\(\overrightarrow{\mathrm{A}}_{\mathrm{net}}=25 \hat{\mathrm{i}}+25 \hat{\mathrm{k}}\)

\(\overrightarrow{\mathrm{B}}=3 \hat{\mathrm{i}}+4 \hat{\mathrm{k}}\)

\(\phi=\overrightarrow{\mathrm{B}} \cdot \overrightarrow{\mathrm{A}}\)

\(=25 \times 3+25 \times 4\)

\(\phi=175 \mathrm{W}{\mathrm{b}}\)

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